std::experimental::weak_ptr

 

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Technical Specifications

 

Technical specifications

Filesystem library (filesystem TS)

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Library fundamentals

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type-erased and polymorphic allocators

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std::experimental::weak_ptr

weak_ptr::weak_ptr

Members and non-members identical to those of std::weak_ptr

 

Defined in header <experimental/memory>
template< class T > class weak_ptr;		(library fundamentals TS)

std::experimental::weak_ptr is a modified version of std::weak_ptr that interoperates with std::experimental::shared_ptr and has support for arrays.

Member types

Member type	Definition
element_type	std::remove_extent_t<T>

Member functions

(constructor)

constructs new weak_ptr (public member function)

Members and non-members identical to std::weak_ptr

Member functions

The following member functions work with std::experimental::shared_ptr instead of std::shared_ptr and std::experimental::weak_ptr instead of std::weak_ptr. The behavior is otherwise identical.

(destructor)	destroys a weak_ptr (public member function of std::weak_ptr)
operator=	assigns the weak_ptr (public member function of std::weak_ptr)
Modifiers
reset	releases the ownership of the managed object (public member function of std::weak_ptr)
swap	swaps the managed objects (public member function of std::weak_ptr)
Observers
use_count	returns the number of shared_ptr objects that manage the object (public member function of std::weak_ptr)
expired	checks whether the referenced object was already deleted (public member function of std::weak_ptr)
lock	creates a shared_ptr that manages the referenced object (public member function of std::weak_ptr)
owner_before	provides owner-based ordering of weak pointers (public member function of std::weak_ptr)

Non-member functions

This non-member function is declared in the std::experimental namespace, and work with std::experimental::weak_ptr rather than std::weak_ptr, but otherwise behaves identically to the corresponding C++14 function.

std::swap(std::weak_ptr) (C++11)

specializes the std::swap algorithm (function template)